PLI Quiz

The following self assessment test is to help you decide which course is best suited to you; foundation or advanced production logging interpretation.

1. A correctly designed Multirate PLT survey can yield the following:
Three answers

Production profile
Layer pressures
Productivity Index
Vertical permeability
Porosity
Water saturation

2. Before running the PL toolstring it is necessary to perform a drift/dummy run to PBTD to check the following?
Two answers

Correct cable speeds attainable and satisfactory winch operation
Sufficient depth to cover planned logging interval
The lubricator can hold and control the tubing head pressure
Clear passage through completion before running the PL string

3. Logging speeds are normally set at approximately:
Two answers

10, 20, 30, 40 feet/minute
10, 20, 30, 40 meters/minute
30, 60, 90, 120 feet/minute
2000, 4000, 6000, 8000 meters/hour

4. Before you start an Emeraude PL interpretation you should:
Four answers

Quality control and qualitatively interpret all raw PL data
Gather fluid PVT properties
Convert measured depths to TVD for true deviated gradio values
Obtain surface rates and job chronology
Convert the LAS to ASCII files
Review the well/reservoir history
Change cable speeds so that up passes have negative cable speeds

5. Where is cable speed used in Emeraude?
Three answers

Spinner calibration
Velocity (VAPP) calculation
Choice of correlation
Differential Pressure Gradio Tool Friction calculations
Nuclear Density Tool Friction calculations
Temperature Analysis

6. Spinner calibration thresholds are more significant in VAPP calculations at:
One answer

High mixture velocities much greater than the spinner threshold values
Low mixture velocities close to the spinner threshold velocity
Both of the above conditions

7. Spinner calibration slopes are more significant in VAPP calculations at:
One answer

High mixture velocities much greater than the spinner threshold values
Low mixture velocities close to the spinner threshold velocity
Both of the above conditions

8. What factors generally affect the spinner slope and threshold values?
Two answers

Tool condition
The average mixture fluid velocity (Vm)
Phases present in the fluid mixture
Wellbore temperature and pressure
The cable speed
Memory or real-time surface readout logging

9. What is VPCF (Velocity Profile Correction Factor) a function of?
Five answers

Fluid density
Fluid viscosity
Zone Rates Model
Reynolds number
Zone Rates Correlation
Spinner blade diameter
Casing size

10. Which is approximately or completely true?
Two answers

VAPP = Vm * 0.83
Vm < VAPP
Vm = VPCF * 0.83
Vm = VAPP * VPCF

11. If you are given the spinner calibration threshold and response slope values, under which of the following conditions can you calculate a fluid velocity?
Select YES or NO

	YES	NO
All the up passes
A single cable speed, spinner sample
All the down passes
All up and down passes
Any single up or down pass
A spinner station reading, logged vs time

12. Which Temperature pass/passes are usually used for interpretation?
One answer

Average down pass
Average of all up and down passes.
Slowest down pass (assuming good data quality)
Temperature pass corresponding to a good spinner pass

13. Where are the PVT properties used in Emeraude?
Three answers

Matching surface conditions
Zone rates cumulative rates calculations
Capacitance calibration
Spinner threshold calibration
Simulation of the nuclear or gradio density measurements

14. What best describes the “MODEL” used in the Zone Rates calculations?
One answer

The fluid system at each calculation zone
The completion design
The PVT system composition describing the fluid properties
The flow regime chosen for each calculation zone

15. Which of these CORRELATIONS take into account deviation?
Four answers

Artep
Dunns & Ross
Aziz & Govier
Petalas & Aziz
Beggs & Brill
ABB deviated
Cte slippage

16. What do the “CORELLATIONS” used in the Zone Rates calculations provide towards the interpretation?
Three answers

Describes the fluid PVT properties
Assist in predicting the flow regimes
Calculate the friction corrections for the nuclear density tool
Predict the pressure drop according to the flow regimes
Provide the slippage velocity used to solve the multiphase solution
Calculate the Vm and VPCF from the VAPP
Predict the non-linearity in the Yw measurement from the Capacitance data.

17. Does the interpreter’s choice of PVT affect the available selection of Models?
One answer

No
Yes
Sometimes

18. In general which is correct?
Four answers

A warming of the temperature profile indicates a flow from deeper in the well
After the well has been shut in for 24 hours, the temperature profile represents the actual reservoir temperature, irregardless of the previous production or injection history
A typical geothermal gradient is about 5degF/100ft (9degC/100m)
The temperature is far more sensitive to fluid entries than the flowmeter
It is normal to have an associated cooling with gas entries into the wellbore
The temperature tool resolution can be as good as 0.01degF (0.006degC)

19. The colored lines shown in Area #1 represent one the following:
One answer

The available flow Models
The available Correlations
The range of solutions for different PVT
The mathematical incoherence in the calculated results

20. The vertical dashed line, arrow #2 represents one of the following:
One answer

The total surface flowrate converted to downhole conditions.
The calculated cumulative downhole rate at the red calculation zone
The total downhole gas rate
The total downhole oil rate

21. The horizontal DASHED line shown by arrow #3 represents one of the following:
One answer

The deviation corrected calculated density
The measured density response from PL toolstring
The simulated matched density
The pseudo density corrected for deviation